property_classmethod.ipynb

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    "class Property:\n",
    "    def __init__(self, fget=None, fset=None, fdel=None):\n",
    "        self.fget = fget\n",
    "        self.fset = fset\n",
    "        self.fdel = fdel\n",
    "    \n",
    "    def __get__(self,  instance, cls):\n",
    "        if self.fget is not None:\n",
    "            return self.fget(instance)\n",
    "        else:\n",
    "            raise AttributeError('property not define getter')\n",
    "    \n",
    "    def __set__(self, instance, value):\n",
    "        if self.fset is not None:\n",
    "            self.fset(instance, value)\n",
    "        else:\n",
    "            raise AttributeError('property not define setter')\n",
    "    \n",
    "    def __delete__(self, instance):\n",
    "        if self.fdel is not None:\n",
    "            self.fdel(instance)\n",
    "        else:\n",
    "            raise AttributeError('property not define deleter')\n",
    "    \n",
    "    def setter(self, fset):\n",
    "        self.fset = fset"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "outputs": [],
   "source": [
    "Spam.x.__get__(spam, Spam)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "class Spam:\n",
    "    def __init__(self, x):\n",
    "        self.__x = x\n",
    "    \n",
    "    #@Property\n",
    "    def x(self):\n",
    "        return self.__x\n",
    "    \n",
    "    #@x.setter\n",
    "    def set_x(self, x):\n",
    "        self.__x = x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "x() missing 1 required positional argument: 'self'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-13-d139d5b9aa93>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mSpam\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mx\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: x() missing 1 required positional argument: 'self'"
     ]
    }
   ],
   "source": [
    "Spam.x()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "spam = Spam(6)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Spam.x(spam)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
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    "collapsed": true
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   "source": []
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  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "spam = Spam(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "spam.x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "spam.x = 4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "spam.x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "class ClassMethod:\n",
    "    def __init__(self, fn):\n",
    "        self.fn = fn\n",
    "    \n",
    "    def __get__(self, instance, cls):\n",
    "        def wrap(*args, **kwargs):\n",
    "            return self.fn(cls, *args, **kwargs)\n",
    "        return wrap"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "class Grok:\n",
    "    x = '123'\n",
    "    \n",
    "    #@ClassMethod\n",
    "    def method(cls):\n",
    "        print(cls.x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "123\n"
     ]
    }
   ],
   "source": [
    "Grok.method(Grok)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "grok = Grok()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "123\n"
     ]
    }
   ],
   "source": [
    "grok.method()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
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   "cell_type": "code",
   "execution_count": null,
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